Thirds to john



(No Model.)

L. ST. PETER. ELECTRIC STOP MOTION FOR ENGINES.

No. 548,589. Batented Oct. 22, 1895.

I .60. ,U/JM gag UNITED STATES PATENT OFFICE.

LOUIS ST. PETER, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR OF TWO- THIRDS TO JOHN D. MILLEA AND THOMAS D. MILLEA, OF SAME PLACE.

ELECTRIC. STOP-MOTION FOR ENGINES.

SPECIFICATION forming part of Letters Patent No. 548,589, dated October 22, 1895.

Application filed March 1, 1895- To all whom it may concern.-

Be it known that I, LOUIS ST. PETER, a snbjectof the Queen of Great Britain, residing at Springfield, in the county of Hampden and State of Massachusetts, have invented new and useful Improvements in Electric Stop- Motions for Steam-Engines, of which the following is a specification.

4 This invention relates to improvements in I0 that class of electrical stop-motions for engines which comprise means for causing the stopping of the engine by pressing a button or otherwise closing a circuit at any point which may be distant from the engine.

The object of this invention is to devise stopmotion devices which shall be applicable to a large variety of valve mechanisms as found in different engines, and which shall be of the utmost simplicity and compactness and susceptible of inexpensive production.

The invention consists in constructions and arrangements of parts for combination with ordinary valve operating mechanisms of steam-engines, all as will hereinafter more fully appear, and be set forth in the claims.

In the accompanying drawings, Figure 1 is a perspective representation of a portion of the ordinary valve mechanism and governor of the common Corliss engine with the pres- 3o ent improved stop-motion so combined therewith that the regulating action of the governor upon the valve mechanism will not be affected by the applied stop-motion, and so that upon occasion the stop-motion will operate 5 to absolutely and instantaneously stop the engine when operated by the push-button to close the circuit. Fig. 2 is an enlarged view showing the manner of connection between parts hereinafter referred to.

The ordinary valve and governor mechanisms, as shown, will be briefly pointed out as identified by numerals of reference, and the parts constituting the stop-motion will be referred to by letters of reference.

As well known in this and other types of engines, there are one or more valves alternately opened.

9 represents one of the valve-operating rods, which is hung to an arm 10, mounted to rock 50 on the shaft or stud 12. The partl has, during the running of the engine, a regular re- Serial No. 540,211. (No model.)

ciprocatory movement and engages in each of its strokes a part which causes the rocking of the arm 10 to properly and in good time effect the lifting of the valve-operating rod 9. The periodicity or extent in duration of the lifting of the said valveoperating rod 9 is controlled by the governor, which acts upon the oscillating collar 15, which is provided with a cam 16, that so acts against the upper jaw 17 of the two-jawed part 20 that by reason of the degree of oscillation of the part 15 and the swinging of the part 20 the duration of the engagement by the grab-hook may be longer or shorter, and in fact when the part 15 is suificiently far oscillated the part 20 will be so far swung that there will be no effect to rock the arm 10.

The governor 22 in rising through the rod 23 upwardly swings the crank-arm 24s of the rocker shaft or stud 25, on which is the lever 26, and to one arm of this lever the connecting-rod 27-is by its one endsecured, while its other extremity is connected to a radial projection 28 of the oscillating part 15, which carrise the cam 16. All of these devices are very common and well known as Well, also, as their mode ot'operation, and it is understood, of course, that during the ordinary running of the engine the degree of oscillation of the part 15 as occasioned through the mechanism mentioned by the raising or lowering of the governor-balls is slight, although in this class of engines, as well known, should the governor-balls be so far raised beyond their normal limits of movement the oscillation of the part 15 will be so great as to cause on each reciprocatory movement of the parts 1e and 20 no engagement and tripping of the grab-hook, and consequently no lifting of the valve-op- 9o crating rod 9, whereupon no steam would be admitted to the cylinder. It will be stated, preliminarily, that the action of this stop-motion is such that upon its operation it so elevates the rod 23 as to effect the required os- 5 cillation of the part 15 to prevent the engine from taking steam, and the devices operating to this end will be now described in detail.

it represents a roller which is adapted to run on the horizontal track or bar I), which IO) may be a part of the framing 30 of the engine. This roller is journaled in the lower end of around the sheave g, its depending portionf l being provided with the weight 2, of considerable preponderance over the force required to raise the governor-balls. This depending portion of the flexible connectionhasthe eye f which is adapted to be hung upon the hooked arm 1' of the lever 'i, which is pivoted 9' represents an electromagnet, for-Which'k is the armature, pivotally mounted at 70 and so poised, as preferably insured by the application of the spring 70 that the armature normally stands Well-away from the end of the electromagnetand serves as a trigger to vrestrain the lever din its position, (indicated in the drawings) in whichit supports the weight h.

It will be here noted that when the weight h is hungupon the hooked arm "L of the said armature-restrained lever the cord connection f and f betweenthe eye f and the roller (1 is sufliciently'slack to permit the slight vibratory movements of the roller as occasioned during the ordinary action of the governor by reason of the said roller being linked to the said rod 23.

The electromagnet is comprised in an open circuit constituted by the wires was, which also comprise a battery or other generator 3 and a circuit-closing device (indicatedat z) in the form of an ordinary push-button.

The operation of this electrical stop-motion is evident on an inspection of the drawings, although it will be stated as follows: Assuming a person in a place distant from the engine-room-as, for instance,'on an upper floor in the factorydesires to instantly stop the engine because of some accident, as, perhaps, on the occasion of an operative becoming caught in themachinery. Upon simplypressing the button at 2 closing the circuit and energizing the electromagnet the armature is is drawn to the electromagnet and out of its restraining position forthe lever 'L', which then so swings as to leave the cordffully subject to the entire draft action of the weight 72, which causes the rod cl to force the rod 23 so far vertically as to, through parts 24, 25, 26,

and 27, so far oscillate the part 15 as to prevent th'e further taking of the grab-hook upon the reciprocatory movements of the part let, in which event, of course, the valve-operating rod 9 (or as the engine is usually equipped, the two of such rods) will not be elevated, and by'reasonof'th'e cessation of the passage of-steam'to the cylinder or cylinders of the engine the latter will stop. In practice the absolute stopping of the engine is effected in from ten to twenty seconds.

The electromagnet is axially horizontal while the armature is vertically hung, so as to-receive and resist endwise the stress of the lever as-established by the weight. Hence this arrangement conduces to simplicity and desired lightnessofconstruction without dispensing in any measure with the required Strength.

Having thus'descrlbed my invention, what I claim, and desire to secure by Letters Patent,is

1. In an electric stop motion for engines, the combination with the track-bar, b, and a reciprocatory part, as 23, of the governor mechanism, of the rod, d, pivoted to the said reciprocatory part and having the roller to move'in said track-bar, the sheave, g, the lever, '11, the weighted cord, f, connected to the said rod, d, and having a guiding engagement with the sheave andhaving in its depending portion the eye, f, and provided at its portion therebelow with the weight, h, the electromagnet having its armature adapted for a restraining engagement with said lever, f, and electric :apparatus 'for duly energizing the saidelectro-magnet, substantially as described.

2. In an electrical stop motion for engines, the combination with a valve operating device of'the engine, of an electro-magnet and armature, electric conductors for forming a circuit,.means for closing the circuit, a lever to act on the valve-operating device and engaged by thearmature of the electro-magnet, all. so that-on the closing of the circuit and energizing of the magnet the armature is withdrawn from its lever-engaging position leaving-the lever free to be swung, substantially as described.

LOUIS ST. PETER.

Witnesses:

H. A. CHAPIN, K. I. CLEMoNs. 

